13 Comae Berenices
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 24m 18.54890s |
| Declination | +26° 05′ 54.9214″ |
| Apparent magnitude (V) | 5.15 – 5.18 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A3 V |
| B−V color index | 0.082±0.003 |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | +0.1±0.1 km/s |
| Proper motion (μ) | RA: −26.158 mas/yr Dec.: −9.385 mas/yr |
| Parallax (π) | 11.1318±0.1589 mas |
| Distance | 293 ± 4 ly (90 ± 1 pc) |
| Absolute magnitude (MV) | 0.38 |
| Details | |
| Mass | 2.83 M☉ |
| Radius | 3.37 R☉ |
| Luminosity | 55 L☉ |
| Surface gravity (log g) | 3.84±0.14 cgs |
| Temperature | 8,846±301 K |
| Metallicity [Fe/H] | 0.24 dex |
| Rotation | 29.5 days |
| Rotational velocity (v sin i) | 48 km/s |
| Age | 429 Myr |
| Other designations | |
| 13 Com, GN Com, BD+26° 2344, HD 107966, HIP 60514, HR 4717, SAO 82291 | |
| Database references | |
| SIMBAD | data |
13 Comae Berenices is a probable binary star system in the northern constellation of Coma Berenices. It has an apparent visual magnitude of 5.2, which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 11.1 mas, it is located around 293 light years from the Sun. It is member of the nearby Coma Star Cluster (Melotte 111).
Based on measured changes in the star's motion, this is most likely an astrometric binary system. The visible component is an A-type main-sequence star with a stellar classification of A3 V. In 1965, Gerhard Jackisch discovered the star is a variable star. It was given its variable star designation, GN Comae Berenices, in 1975. It is catalogued as an Alpha2 Canum Venaticorum variable. Rensom (1990) listed it as a suspected Am star. The system is a source of X-ray emission, which may be coming from the companion.